Grinding-mill.



No. 812,737. PATENTED FEB. 13, 1906.

w. HALSTEAD. GRINDING MILL.

APPLICATION FILED I'EB.1. 1905.

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' WILLARD HALSTEAD, OF

SYRACUSE, NEW YORK, ASSIGNOR TO THE ENGELBERG HULLER COMPANY, OF SYRACUSE, NEW YORK, A COR- PORATION OF WEST VIRGINIA.

GRINDING-MILL.-

Specification of Letters Patent.

Patented Feb. 13, 1906.

Application filed February 1, 1905. Serial No. 243,647.

To all whom it may concern.-

Be it known that I, WILLARD HALsTEAD, a citizen of the United States, residing at Syracuse, in the county of Onondaga and State of New York, have invented certain new and useful Improvements in Grinding-.Mills, of which the following is a specification.

My invention especially relates to grindingmills of the class generally known as attrition-mills, which are used for grinding corn and other grain. In this class of mills the grinding-surfaces are usually formed on segmental metallic plates, which are attached to opposing grinding-heads in such manner as to form grinding-disks that revolve rapidly in opposite directions. One of the grindingheads, known as the feed-head, is provided at the center with an eye which communicates with the spout of a feed-hopper and through which the grain passes to the opposing grinding-disks, which deliver the grain by centrifugal force through or between the grinding-surfaces. In grinding-mills of this class there has often been leakage of whole grain at the joint between the spout of the hopper and the feed-head, and often the ground product has been thus mixed with a considerable percentage of whole or unground grain within the grinding-case, which is of course very objectionable. Joints of various kinds have been devised to prevent this; but it has been diflicult to keep such joints tight. By my present invention I provide means whereby should there be a leakage of whole grain at the joint of the feed-spout with the grinding-disks such grain, instead of passing into the grinding-case and mixing with the meal, will pass to the outside of the case, thus not damaging the product.

In the accompanying drawings, Figure 1 shows a vertical central section of so much of an attrition-mill with my improvements applied as is necessary to illustrate my invention. Fig. 2 shows a vertical section on the line 2 2 of Fig. 1. Fig.3 shows a side elevation of the feed-head.

The casing A incloses the grinding-heads B and C, which are attached, respectively, to

the driving-shafts B and C and are operated in the usual way. The hopper D is provided with feed devices (1 and a slide or gate d, of well-known construction, and with a spout or chute E, which communicates with the grinders. At its lower end the spout is formed with a semicircular discharge opening or mouth 6, which projects laterally through a circular opening in the casing surrounding the driving-shaft C The feed-head C is formed with an annular opening 0, surrounding the hub c, to allow grain to pass from the spout to the grinding-surfaces between the disks, and this opening is bridged by arms 0 radiating from the hub. Surrounding the opening 0 and projecting laterally from the feed-head C is an annular flange F, which projects through the circular opening in the casing and runs close to the outer edge or wall of said opening. It also runs close to the curved upper face of the lateral projection e of the spout, as shown in Figs 1 and 2. It will be observed that the lower part of the spout is semicircular and extends half-way around the shaft C. In order to close the opening in the casing below, the shaft, I employ a segmental plate G, having arms 7 attached to the casing in the manner shown in Fig. 2. Thus the flange F is made to extend through an annular opening in the grinder-case and to so closely fit the opening as to prevent any great tendency to leak; but should there be leakage the grain will all pass to the outside of the mill, as obviously it would not, under any circumstances, first pass out at x and then pass in at 3/, as it would have to do in order to mix with the ground product within the casing. In this way by a very simple construction I am enabled to entirely obviate the tendency of such mills to leak whole grain into the casing, which hasv heretofore been such an objectionable feature in mills of this class.

I claim as my invention A grinding-mill comprising a casing having a circular opening on one side, rotating grinding-heads within the casing, shafts extending into the casing to which the grinding-heads are secured, a feed-spout entering an opening casing and closely surrounding the mouth of in the side of'the easlng and having a semicirthe spout and the segmental plate.

cular discharge mouth partially embracing In testimony whereof I have hereunto subthe driving-shaft of one of the grinding-heads, scribed my name.

5 a segmental plate attached to the side of the .WILLARD HALSTEAD.

case and partially filling the opening therein Witnesses: and a flange on one of the grinding-heads eX- N. J. LINDENMEYER,

tending through the annular opening in the G. D. RETZBAGH. 

